HAMMER - Fix long stalls when writing out core files
[dragonfly.git] / sys / vfs / hammer / hammer_vfsops.c
1 /*
2  * Copyright (c) 2007-2008 The DragonFly Project.  All rights reserved.
3  * 
4  * This code is derived from software contributed to The DragonFly Project
5  * by Matthew Dillon <dillon@backplane.com>
6  * 
7  * Redistribution and use in source and binary forms, with or without
8  * modification, are permitted provided that the following conditions
9  * are met:
10  * 
11  * 1. Redistributions of source code must retain the above copyright
12  *    notice, this list of conditions and the following disclaimer.
13  * 2. Redistributions in binary form must reproduce the above copyright
14  *    notice, this list of conditions and the following disclaimer in
15  *    the documentation and/or other materials provided with the
16  *    distribution.
17  * 3. Neither the name of The DragonFly Project nor the names of its
18  *    contributors may be used to endorse or promote products derived
19  *    from this software without specific, prior written permission.
20  * 
21  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
22  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
23  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
24  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE
25  * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
26  * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
27  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
28  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
29  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
30  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
31  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32  * SUCH DAMAGE.
33  * 
34  * $DragonFly: src/sys/vfs/hammer/hammer_vfsops.c,v 1.74 2008/11/13 02:18:43 dillon Exp $
35  */
36
37 #include <sys/param.h>
38 #include <sys/systm.h>
39 #include <sys/kernel.h>
40 #include <sys/vnode.h>
41 #include <sys/mount.h>
42 #include <sys/malloc.h>
43 #include <sys/nlookup.h>
44 #include <sys/fcntl.h>
45 #include <sys/sysctl.h>
46 #include <sys/buf.h>
47 #include <sys/buf2.h>
48 #include "hammer.h"
49
50 /*
51  * NOTE!  Global statistics may not be MPSAFE so HAMMER never uses them
52  *        in conditionals.
53  */
54 int hammer_supported_version = HAMMER_VOL_VERSION_DEFAULT;
55 int hammer_debug_io;
56 int hammer_debug_general;
57 int hammer_debug_debug = 1;             /* medium-error panics */ 
58 int hammer_debug_inode;
59 int hammer_debug_locks;
60 int hammer_debug_btree;
61 int hammer_debug_tid;
62 int hammer_debug_recover;               /* -1 will disable, +1 will force */
63 int hammer_debug_recover_faults;
64 int hammer_debug_critical;              /* non-zero enter debugger on error */
65 int hammer_cluster_enable = 1;          /* enable read clustering by default */
66 int hammer_live_dedup = 0;
67 int hammer_count_fsyncs;
68 int hammer_count_inodes;
69 int hammer_count_iqueued;
70 int hammer_count_reclaiming;
71 int hammer_count_records;
72 int hammer_count_record_datas;
73 int hammer_count_volumes;
74 int hammer_count_buffers;
75 int hammer_count_nodes;
76 int64_t hammer_count_extra_space_used;
77 int64_t hammer_stats_btree_lookups;
78 int64_t hammer_stats_btree_searches;
79 int64_t hammer_stats_btree_inserts;
80 int64_t hammer_stats_btree_deletes;
81 int64_t hammer_stats_btree_elements;
82 int64_t hammer_stats_btree_splits;
83 int64_t hammer_stats_btree_iterations;
84 int64_t hammer_stats_btree_root_iterations;
85 int64_t hammer_stats_record_iterations;
86
87 int64_t hammer_stats_file_read;
88 int64_t hammer_stats_file_write;
89 int64_t hammer_stats_file_iopsr;
90 int64_t hammer_stats_file_iopsw;
91 int64_t hammer_stats_disk_read;
92 int64_t hammer_stats_disk_write;
93 int64_t hammer_stats_inode_flushes;
94 int64_t hammer_stats_commits;
95 int64_t hammer_stats_undo;
96 int64_t hammer_stats_redo;
97
98 int hammer_count_dirtybufspace;         /* global */
99 int hammer_count_refedbufs;             /* global */
100 int hammer_count_reservations;
101 int hammer_count_io_running_read;
102 int hammer_count_io_running_write;
103 int hammer_count_io_locked;
104 int hammer_limit_dirtybufspace;         /* per-mount */
105 int hammer_limit_running_io;            /* per-mount */
106 int hammer_limit_recs;                  /* as a whole XXX */
107 int hammer_limit_inode_recs = 2048;     /* per inode */
108 int hammer_limit_reclaim;
109 int hammer_live_dedup_cache_size = DEDUP_CACHE_SIZE;
110 int hammer_limit_redo = 4096 * 1024;    /* per inode */
111 int hammer_autoflush = 500;             /* auto flush (typ on reclaim) */
112 int hammer_bio_count;
113 int hammer_verify_zone;
114 int hammer_verify_data = 1;
115 int hammer_write_mode;
116 int hammer_double_buffer;
117 int hammer_yield_check = 16;
118 int hammer_fsync_mode = 3;
119 int64_t hammer_contention_count;
120 int64_t hammer_zone_limit;
121
122 /*
123  * Live dedup debug counters (sysctls are writable so that counters
124  * can be reset from userspace).
125  */
126 int64_t hammer_live_dedup_vnode_bcmps = 0;
127 int64_t hammer_live_dedup_device_bcmps = 0;
128 int64_t hammer_live_dedup_findblk_failures = 0;
129 int64_t hammer_live_dedup_bmap_saves = 0;
130
131
132 SYSCTL_NODE(_vfs, OID_AUTO, hammer, CTLFLAG_RW, 0, "HAMMER filesystem");
133
134 SYSCTL_INT(_vfs_hammer, OID_AUTO, supported_version, CTLFLAG_RD,
135            &hammer_supported_version, 0, "");
136 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_general, CTLFLAG_RW,
137            &hammer_debug_general, 0, "");
138 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_io, CTLFLAG_RW,
139            &hammer_debug_io, 0, "");
140 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_debug, CTLFLAG_RW,
141            &hammer_debug_debug, 0, "");
142 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_inode, CTLFLAG_RW,
143            &hammer_debug_inode, 0, "");
144 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_locks, CTLFLAG_RW,
145            &hammer_debug_locks, 0, "");
146 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_btree, CTLFLAG_RW,
147            &hammer_debug_btree, 0, "");
148 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_tid, CTLFLAG_RW,
149            &hammer_debug_tid, 0, "");
150 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_recover, CTLFLAG_RW,
151            &hammer_debug_recover, 0, "");
152 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_recover_faults, CTLFLAG_RW,
153            &hammer_debug_recover_faults, 0, "");
154 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_critical, CTLFLAG_RW,
155            &hammer_debug_critical, 0, "");
156 SYSCTL_INT(_vfs_hammer, OID_AUTO, cluster_enable, CTLFLAG_RW,
157            &hammer_cluster_enable, 0, "");
158 /*
159  * 0 - live dedup is disabled
160  * 1 - dedup cache is populated on reads only
161  * 2 - dedup cache is populated on both reads and writes
162  */
163 SYSCTL_INT(_vfs_hammer, OID_AUTO, live_dedup, CTLFLAG_RW,
164            &hammer_live_dedup, 0, "Enable live dedup");
165
166 SYSCTL_INT(_vfs_hammer, OID_AUTO, limit_dirtybufspace, CTLFLAG_RW,
167            &hammer_limit_dirtybufspace, 0, "");
168 SYSCTL_INT(_vfs_hammer, OID_AUTO, limit_running_io, CTLFLAG_RW,
169            &hammer_limit_running_io, 0, "");
170 SYSCTL_INT(_vfs_hammer, OID_AUTO, limit_recs, CTLFLAG_RW,
171            &hammer_limit_recs, 0, "");
172 SYSCTL_INT(_vfs_hammer, OID_AUTO, limit_inode_recs, CTLFLAG_RW,
173            &hammer_limit_inode_recs, 0, "");
174 SYSCTL_INT(_vfs_hammer, OID_AUTO, limit_reclaim, CTLFLAG_RW,
175            &hammer_limit_reclaim, 0, "");
176 SYSCTL_INT(_vfs_hammer, OID_AUTO, live_dedup_cache_size, CTLFLAG_RW,
177            &hammer_live_dedup_cache_size, 0,
178            "Number of cache entries");
179 SYSCTL_INT(_vfs_hammer, OID_AUTO, limit_redo, CTLFLAG_RW,
180            &hammer_limit_redo, 0, "");
181
182 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_fsyncs, CTLFLAG_RD,
183            &hammer_count_fsyncs, 0, "");
184 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_inodes, CTLFLAG_RD,
185            &hammer_count_inodes, 0, "");
186 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_iqueued, CTLFLAG_RD,
187            &hammer_count_iqueued, 0, "");
188 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_reclaiming, CTLFLAG_RD,
189            &hammer_count_reclaiming, 0, "");
190 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_records, CTLFLAG_RD,
191            &hammer_count_records, 0, "");
192 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_record_datas, CTLFLAG_RD,
193            &hammer_count_record_datas, 0, "");
194 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_volumes, CTLFLAG_RD,
195            &hammer_count_volumes, 0, "");
196 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_buffers, CTLFLAG_RD,
197            &hammer_count_buffers, 0, "");
198 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_nodes, CTLFLAG_RD,
199            &hammer_count_nodes, 0, "");
200 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, count_extra_space_used, CTLFLAG_RD,
201            &hammer_count_extra_space_used, 0, "");
202
203 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_searches, CTLFLAG_RD,
204            &hammer_stats_btree_searches, 0, "");
205 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_lookups, CTLFLAG_RD,
206            &hammer_stats_btree_lookups, 0, "");
207 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_inserts, CTLFLAG_RD,
208            &hammer_stats_btree_inserts, 0, "");
209 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_deletes, CTLFLAG_RD,
210            &hammer_stats_btree_deletes, 0, "");
211 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_elements, CTLFLAG_RD,
212            &hammer_stats_btree_elements, 0, "");
213 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_splits, CTLFLAG_RD,
214            &hammer_stats_btree_splits, 0, "");
215 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_iterations, CTLFLAG_RD,
216            &hammer_stats_btree_iterations, 0, "");
217 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_root_iterations, CTLFLAG_RD,
218            &hammer_stats_btree_root_iterations, 0, "");
219 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_record_iterations, CTLFLAG_RD,
220            &hammer_stats_record_iterations, 0, "");
221
222 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_file_read, CTLFLAG_RD,
223            &hammer_stats_file_read, 0, "");
224 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_file_write, CTLFLAG_RD,
225            &hammer_stats_file_write, 0, "");
226 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_file_iopsr, CTLFLAG_RD,
227            &hammer_stats_file_iopsr, 0, "");
228 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_file_iopsw, CTLFLAG_RD,
229            &hammer_stats_file_iopsw, 0, "");
230 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_disk_read, CTLFLAG_RD,
231            &hammer_stats_disk_read, 0, "");
232 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_disk_write, CTLFLAG_RD,
233            &hammer_stats_disk_write, 0, "");
234 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_inode_flushes, CTLFLAG_RD,
235            &hammer_stats_inode_flushes, 0, "");
236 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_commits, CTLFLAG_RD,
237            &hammer_stats_commits, 0, "");
238 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_undo, CTLFLAG_RD,
239            &hammer_stats_undo, 0, "");
240 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_redo, CTLFLAG_RD,
241            &hammer_stats_redo, 0, "");
242
243 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, live_dedup_vnode_bcmps, CTLFLAG_RW,
244             &hammer_live_dedup_vnode_bcmps, 0,
245             "successful vnode buffer comparisons");
246 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, live_dedup_device_bcmps, CTLFLAG_RW,
247             &hammer_live_dedup_device_bcmps, 0,
248             "successful device buffer comparisons");
249 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, live_dedup_findblk_failures, CTLFLAG_RW,
250             &hammer_live_dedup_findblk_failures, 0,
251             "block lookup failures for comparison");
252 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, live_dedup_bmap_saves, CTLFLAG_RW,
253             &hammer_live_dedup_bmap_saves, 0,
254             "useful physical block lookups");
255
256 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_dirtybufspace, CTLFLAG_RD,
257            &hammer_count_dirtybufspace, 0, "");
258 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_refedbufs, CTLFLAG_RD,
259            &hammer_count_refedbufs, 0, "");
260 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_reservations, CTLFLAG_RD,
261            &hammer_count_reservations, 0, "");
262 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_io_running_read, CTLFLAG_RD,
263            &hammer_count_io_running_read, 0, "");
264 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_io_locked, CTLFLAG_RD,
265            &hammer_count_io_locked, 0, "");
266 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_io_running_write, CTLFLAG_RD,
267            &hammer_count_io_running_write, 0, "");
268 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, zone_limit, CTLFLAG_RW,
269            &hammer_zone_limit, 0, "");
270 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, contention_count, CTLFLAG_RW,
271            &hammer_contention_count, 0, "");
272 SYSCTL_INT(_vfs_hammer, OID_AUTO, autoflush, CTLFLAG_RW,
273            &hammer_autoflush, 0, "");
274 SYSCTL_INT(_vfs_hammer, OID_AUTO, verify_zone, CTLFLAG_RW,
275            &hammer_verify_zone, 0, "");
276 SYSCTL_INT(_vfs_hammer, OID_AUTO, verify_data, CTLFLAG_RW,
277            &hammer_verify_data, 0, "");
278 SYSCTL_INT(_vfs_hammer, OID_AUTO, write_mode, CTLFLAG_RW,
279            &hammer_write_mode, 0, "");
280 SYSCTL_INT(_vfs_hammer, OID_AUTO, double_buffer, CTLFLAG_RW,
281            &hammer_double_buffer, 0, "");
282 SYSCTL_INT(_vfs_hammer, OID_AUTO, yield_check, CTLFLAG_RW,
283            &hammer_yield_check, 0, "");
284 SYSCTL_INT(_vfs_hammer, OID_AUTO, fsync_mode, CTLFLAG_RW,
285            &hammer_fsync_mode, 0, "");
286
287 KTR_INFO_MASTER(hammer);
288
289 /*
290  * VFS ABI
291  */
292 static void     hammer_free_hmp(struct mount *mp);
293
294 static int      hammer_vfs_mount(struct mount *mp, char *path, caddr_t data,
295                                 struct ucred *cred);
296 static int      hammer_vfs_unmount(struct mount *mp, int mntflags);
297 static int      hammer_vfs_root(struct mount *mp, struct vnode **vpp);
298 static int      hammer_vfs_statfs(struct mount *mp, struct statfs *sbp,
299                                 struct ucred *cred);
300 static int      hammer_vfs_statvfs(struct mount *mp, struct statvfs *sbp,
301                                 struct ucred *cred);
302 static int      hammer_vfs_sync(struct mount *mp, int waitfor);
303 static int      hammer_vfs_vget(struct mount *mp, struct vnode *dvp,
304                                 ino_t ino, struct vnode **vpp);
305 static int      hammer_vfs_init(struct vfsconf *conf);
306 static int      hammer_vfs_fhtovp(struct mount *mp, struct vnode *rootvp,
307                                 struct fid *fhp, struct vnode **vpp);
308 static int      hammer_vfs_vptofh(struct vnode *vp, struct fid *fhp);
309 static int      hammer_vfs_checkexp(struct mount *mp, struct sockaddr *nam,
310                                 int *exflagsp, struct ucred **credanonp);
311
312
313 static struct vfsops hammer_vfsops = {
314         .vfs_mount      = hammer_vfs_mount,
315         .vfs_unmount    = hammer_vfs_unmount,
316         .vfs_root       = hammer_vfs_root,
317         .vfs_statfs     = hammer_vfs_statfs,
318         .vfs_statvfs    = hammer_vfs_statvfs,
319         .vfs_sync       = hammer_vfs_sync,
320         .vfs_vget       = hammer_vfs_vget,
321         .vfs_init       = hammer_vfs_init,
322         .vfs_vptofh     = hammer_vfs_vptofh,
323         .vfs_fhtovp     = hammer_vfs_fhtovp,
324         .vfs_checkexp   = hammer_vfs_checkexp
325 };
326
327 MALLOC_DEFINE(M_HAMMER, "HAMMER-mount", "");
328
329 VFS_SET(hammer_vfsops, hammer, 0);
330 MODULE_VERSION(hammer, 1);
331
332 static int
333 hammer_vfs_init(struct vfsconf *conf)
334 {
335         int n;
336
337         if (hammer_limit_recs == 0) {
338                 hammer_limit_recs = nbuf * 25;
339                 n = kmalloc_limit(M_HAMMER) / 512;
340                 if (hammer_limit_recs > n)
341                         hammer_limit_recs = n;
342         }
343         if (hammer_limit_dirtybufspace == 0) {
344                 hammer_limit_dirtybufspace = hidirtybufspace / 2;
345                 if (hammer_limit_dirtybufspace < 100)
346                         hammer_limit_dirtybufspace = 100;
347         }
348
349         /*
350          * Set reasonable limits to maintain an I/O pipeline.  This is
351          * used by the flush code which explicitly initiates I/O, and
352          * is per-mount.
353          *
354          * The system-driven buffer cache uses vfs.lorunningspace and
355          * vfs.hirunningspace globally.
356          */
357         if (hammer_limit_running_io == 0)
358                 hammer_limit_running_io = hammer_limit_dirtybufspace;
359         if (hammer_limit_running_io > 10 * 1024 * 1024)
360                 hammer_limit_running_io = 10 * 1024 * 1024;
361
362         /*
363          * The hammer_inode structure detaches from the vnode on reclaim.
364          * This limits the number of inodes in this state to prevent a
365          * memory pool blowout.
366          */
367         if (hammer_limit_reclaim == 0)
368                 hammer_limit_reclaim = desiredvnodes / 10;
369
370         return(0);
371 }
372
373 static int
374 hammer_vfs_mount(struct mount *mp, char *mntpt, caddr_t data,
375                  struct ucred *cred)
376 {
377         struct hammer_mount_info info;
378         hammer_mount_t hmp;
379         hammer_volume_t rootvol;
380         struct vnode *rootvp;
381         struct vnode *devvp = NULL;
382         const char *upath;      /* volume name in userspace */
383         char *path;             /* volume name in system space */
384         int error;
385         int i;
386         int master_id;
387         char *next_volume_ptr = NULL;
388
389         /*
390          * Accept hammer_mount_info.  mntpt is NULL for root mounts at boot.
391          */
392         if (mntpt == NULL) {
393                 bzero(&info, sizeof(info));
394                 info.asof = 0;
395                 info.hflags = 0;
396                 info.nvolumes = 1;
397
398                 next_volume_ptr = mp->mnt_stat.f_mntfromname;
399
400                 /* Count number of volumes separated by ':' */
401                 for (char *p = next_volume_ptr; *p != '\0'; ++p) {
402                         if (*p == ':') {
403                                 ++info.nvolumes;
404                         }
405                 }
406
407                 mp->mnt_flag &= ~MNT_RDONLY; /* mount R/W */
408         } else {
409                 if ((error = copyin(data, &info, sizeof(info))) != 0)
410                         return (error);
411         }
412
413         /*
414          * updating or new mount
415          */
416         if (mp->mnt_flag & MNT_UPDATE) {
417                 hmp = (void *)mp->mnt_data;
418                 KKASSERT(hmp != NULL);
419         } else {
420                 if (info.nvolumes <= 0 || info.nvolumes >= 32768)
421                         return (EINVAL);
422                 hmp = NULL;
423         }
424
425         /*
426          * master-id validation.  The master id may not be changed by a
427          * mount update.
428          */
429         if (info.hflags & HMNT_MASTERID) {
430                 if (hmp && hmp->master_id != info.master_id) {
431                         kprintf("hammer: cannot change master id "
432                                 "with mount update\n");
433                         return(EINVAL);
434                 }
435                 master_id = info.master_id;
436                 if (master_id < -1 || master_id >= HAMMER_MAX_MASTERS)
437                         return (EINVAL);
438         } else {
439                 if (hmp)
440                         master_id = hmp->master_id;
441                 else
442                         master_id = 0;
443         }
444
445         /*
446          * Internal mount data structure
447          */
448         if (hmp == NULL) {
449                 hmp = kmalloc(sizeof(*hmp), M_HAMMER, M_WAITOK | M_ZERO);
450                 mp->mnt_data = (qaddr_t)hmp;
451                 hmp->mp = mp;
452                 /*TAILQ_INIT(&hmp->recycle_list);*/
453
454                 /*
455                  * Make sure kmalloc type limits are set appropriately.
456                  *
457                  * Our inode kmalloc group is sized based on maxvnodes
458                  * (controlled by the system, not us).
459                  */
460                 kmalloc_create(&hmp->m_misc, "HAMMER-others");
461                 kmalloc_create(&hmp->m_inodes, "HAMMER-inodes");
462
463                 kmalloc_raise_limit(hmp->m_inodes, 0);  /* unlimited */
464
465                 hmp->root_btree_beg.localization = 0x00000000U;
466                 hmp->root_btree_beg.obj_id = -0x8000000000000000LL;
467                 hmp->root_btree_beg.key = -0x8000000000000000LL;
468                 hmp->root_btree_beg.create_tid = 1;
469                 hmp->root_btree_beg.delete_tid = 1;
470                 hmp->root_btree_beg.rec_type = 0;
471                 hmp->root_btree_beg.obj_type = 0;
472
473                 hmp->root_btree_end.localization = 0xFFFFFFFFU;
474                 hmp->root_btree_end.obj_id = 0x7FFFFFFFFFFFFFFFLL;
475                 hmp->root_btree_end.key = 0x7FFFFFFFFFFFFFFFLL;
476                 hmp->root_btree_end.create_tid = 0xFFFFFFFFFFFFFFFFULL;
477                 hmp->root_btree_end.delete_tid = 0;   /* special case */
478                 hmp->root_btree_end.rec_type = 0xFFFFU;
479                 hmp->root_btree_end.obj_type = 0;
480
481                 hmp->krate.freq = 1;    /* maximum reporting rate (hz) */
482                 hmp->krate.count = -16; /* initial burst */
483
484                 hmp->sync_lock.refs = 1;
485                 hmp->free_lock.refs = 1;
486                 hmp->undo_lock.refs = 1;
487                 hmp->blkmap_lock.refs = 1;
488                 hmp->snapshot_lock.refs = 1;
489                 hmp->volume_lock.refs = 1;
490
491                 TAILQ_INIT(&hmp->delay_list);
492                 TAILQ_INIT(&hmp->flush_group_list);
493                 TAILQ_INIT(&hmp->objid_cache_list);
494                 TAILQ_INIT(&hmp->undo_lru_list);
495                 TAILQ_INIT(&hmp->reclaim_list);
496
497                 RB_INIT(&hmp->rb_dedup_crc_root);
498                 RB_INIT(&hmp->rb_dedup_off_root);       
499                 TAILQ_INIT(&hmp->dedup_lru_list);
500         }
501         hmp->hflags &= ~HMNT_USERFLAGS;
502         hmp->hflags |= info.hflags & HMNT_USERFLAGS;
503
504         hmp->master_id = master_id;
505
506         if (info.asof) {
507                 mp->mnt_flag |= MNT_RDONLY;
508                 hmp->asof = info.asof;
509         } else {
510                 hmp->asof = HAMMER_MAX_TID;
511         }
512
513         hmp->volume_to_remove = -1;
514
515         /*
516          * Re-open read-write if originally read-only, or vise-versa.
517          *
518          * When going from read-only to read-write execute the stage2
519          * recovery if it has not already been run.
520          */
521         if (mp->mnt_flag & MNT_UPDATE) {
522                 lwkt_gettoken(&hmp->fs_token);
523                 error = 0;
524                 if (hmp->ronly && (mp->mnt_kern_flag & MNTK_WANTRDWR)) {
525                         kprintf("HAMMER read-only -> read-write\n");
526                         hmp->ronly = 0;
527                         RB_SCAN(hammer_vol_rb_tree, &hmp->rb_vols_root, NULL,
528                                 hammer_adjust_volume_mode, NULL);
529                         rootvol = hammer_get_root_volume(hmp, &error);
530                         if (rootvol) {
531                                 hammer_recover_flush_buffers(hmp, rootvol, 1);
532                                 error = hammer_recover_stage2(hmp, rootvol);
533                                 bcopy(rootvol->ondisk->vol0_blockmap,
534                                       hmp->blockmap,
535                                       sizeof(hmp->blockmap));
536                                 hammer_rel_volume(rootvol, 0);
537                         }
538                         RB_SCAN(hammer_ino_rb_tree, &hmp->rb_inos_root, NULL,
539                                 hammer_reload_inode, NULL);
540                         /* kernel clears MNT_RDONLY */
541                 } else if (hmp->ronly == 0 && (mp->mnt_flag & MNT_RDONLY)) {
542                         kprintf("HAMMER read-write -> read-only\n");
543                         hmp->ronly = 1; /* messy */
544                         RB_SCAN(hammer_ino_rb_tree, &hmp->rb_inos_root, NULL,
545                                 hammer_reload_inode, NULL);
546                         hmp->ronly = 0;
547                         hammer_flusher_sync(hmp);
548                         hammer_flusher_sync(hmp);
549                         hammer_flusher_sync(hmp);
550                         hmp->ronly = 1;
551                         RB_SCAN(hammer_vol_rb_tree, &hmp->rb_vols_root, NULL,
552                                 hammer_adjust_volume_mode, NULL);
553                 }
554                 lwkt_reltoken(&hmp->fs_token);
555                 return(error);
556         }
557
558         RB_INIT(&hmp->rb_vols_root);
559         RB_INIT(&hmp->rb_inos_root);
560         RB_INIT(&hmp->rb_redo_root);
561         RB_INIT(&hmp->rb_nods_root);
562         RB_INIT(&hmp->rb_undo_root);
563         RB_INIT(&hmp->rb_resv_root);
564         RB_INIT(&hmp->rb_bufs_root);
565         RB_INIT(&hmp->rb_pfsm_root);
566
567         hmp->ronly = ((mp->mnt_flag & MNT_RDONLY) != 0);
568
569         RB_INIT(&hmp->volu_root);
570         RB_INIT(&hmp->undo_root);
571         RB_INIT(&hmp->data_root);
572         RB_INIT(&hmp->meta_root);
573         RB_INIT(&hmp->lose_root);
574         TAILQ_INIT(&hmp->iorun_list);
575
576         lwkt_token_init(&hmp->fs_token, "hammerfs");
577         lwkt_token_init(&hmp->io_token, "hammerio");
578
579         lwkt_gettoken(&hmp->fs_token);
580
581         /*
582          * Load volumes
583          */
584         path = objcache_get(namei_oc, M_WAITOK);
585         hmp->nvolumes = -1;
586         for (i = 0; i < info.nvolumes; ++i) {
587                 if (mntpt == NULL) {
588                         /*
589                          * Root mount.
590                          */
591                         KKASSERT(next_volume_ptr != NULL);
592                         strcpy(path, "");
593                         if (*next_volume_ptr != '/') {
594                                 /* relative path */
595                                 strcpy(path, "/dev/");
596                         }
597                         int k;
598                         for (k = strlen(path); k < MAXPATHLEN-1; ++k) {
599                                 if (*next_volume_ptr == '\0') {
600                                         break;
601                                 } else if (*next_volume_ptr == ':') {
602                                         ++next_volume_ptr;
603                                         break;
604                                 } else {
605                                         path[k] = *next_volume_ptr;
606                                         ++next_volume_ptr;
607                                 }
608                         }
609                         path[k] = '\0';
610
611                         error = 0;
612                         cdev_t dev = kgetdiskbyname(path);
613                         error = bdevvp(dev, &devvp);
614                         if (error) {
615                                 kprintf("hammer_mountroot: can't find devvp\n");
616                         }
617                 } else {
618                         error = copyin(&info.volumes[i], &upath,
619                                        sizeof(char *));
620                         if (error == 0)
621                                 error = copyinstr(upath, path,
622                                                   MAXPATHLEN, NULL);
623                 }
624                 if (error == 0)
625                         error = hammer_install_volume(hmp, path, devvp);
626                 if (error)
627                         break;
628         }
629         objcache_put(namei_oc, path);
630
631         /*
632          * Make sure we found a root volume
633          */
634         if (error == 0 && hmp->rootvol == NULL) {
635                 kprintf("hammer_mount: No root volume found!\n");
636                 error = EINVAL;
637         }
638
639         /*
640          * Check that all required volumes are available
641          */
642         if (error == 0 && hammer_mountcheck_volumes(hmp)) {
643                 kprintf("hammer_mount: Missing volumes, cannot mount!\n");
644                 error = EINVAL;
645         }
646
647         if (error) {
648                 /* called with fs_token held */
649                 hammer_free_hmp(mp);
650                 return (error);
651         }
652
653         /*
654          * No errors, setup enough of the mount point so we can lookup the
655          * root vnode.
656          */
657         mp->mnt_iosize_max = MAXPHYS;
658         mp->mnt_kern_flag |= MNTK_FSMID;
659
660         /*
661          * MPSAFE code.  Note that VOPs and VFSops which are not MPSAFE
662          * will acquire a per-mount token prior to entry and release it
663          * on return, so even if we do not specify it we no longer get
664          * the BGL regardlless of how we are flagged.
665          */
666         mp->mnt_kern_flag |= MNTK_ALL_MPSAFE;
667         /*MNTK_RD_MPSAFE | MNTK_GA_MPSAFE | MNTK_IN_MPSAFE;*/
668
669         /* 
670          * note: f_iosize is used by vnode_pager_haspage() when constructing
671          * its VOP_BMAP call.
672          */
673         mp->mnt_stat.f_iosize = HAMMER_BUFSIZE;
674         mp->mnt_stat.f_bsize = HAMMER_BUFSIZE;
675
676         mp->mnt_vstat.f_frsize = HAMMER_BUFSIZE;
677         mp->mnt_vstat.f_bsize = HAMMER_BUFSIZE;
678
679         mp->mnt_maxsymlinklen = 255;
680         mp->mnt_flag |= MNT_LOCAL;
681
682         vfs_add_vnodeops(mp, &hammer_vnode_vops, &mp->mnt_vn_norm_ops);
683         vfs_add_vnodeops(mp, &hammer_spec_vops, &mp->mnt_vn_spec_ops);
684         vfs_add_vnodeops(mp, &hammer_fifo_vops, &mp->mnt_vn_fifo_ops);
685
686         /*
687          * The root volume's ondisk pointer is only valid if we hold a
688          * reference to it.
689          */
690         rootvol = hammer_get_root_volume(hmp, &error);
691         if (error)
692                 goto failed;
693
694         /*
695          * Perform any necessary UNDO operations.  The recovery code does
696          * call hammer_undo_lookup() so we have to pre-cache the blockmap,
697          * and then re-copy it again after recovery is complete.
698          *
699          * If this is a read-only mount the UNDO information is retained
700          * in memory in the form of dirty buffer cache buffers, and not
701          * written back to the media.
702          */
703         bcopy(rootvol->ondisk->vol0_blockmap, hmp->blockmap,
704               sizeof(hmp->blockmap));
705
706         /*
707          * Check filesystem version
708          */
709         hmp->version = rootvol->ondisk->vol_version;
710         if (hmp->version < HAMMER_VOL_VERSION_MIN ||
711             hmp->version > HAMMER_VOL_VERSION_MAX) {
712                 kprintf("HAMMER: mount unsupported fs version %d\n",
713                         hmp->version);
714                 error = ERANGE;
715                 goto done;
716         }
717
718         /*
719          * The undo_rec_limit limits the size of flush groups to avoid
720          * blowing out the UNDO FIFO.  This calculation is typically in
721          * the tens of thousands and is designed primarily when small
722          * HAMMER filesystems are created.
723          */
724         hmp->undo_rec_limit = hammer_undo_max(hmp) / 8192 + 100;
725         if (hammer_debug_general & 0x0001)
726                 kprintf("HAMMER: undo_rec_limit %d\n", hmp->undo_rec_limit);
727
728         /*
729          * NOTE: Recover stage1 not only handles meta-data recovery, it
730          *       also sets hmp->undo_seqno for HAMMER VERSION 4+ filesystems.
731          */
732         error = hammer_recover_stage1(hmp, rootvol);
733         if (error) {
734                 kprintf("Failed to recover HAMMER filesystem on mount\n");
735                 goto done;
736         }
737
738         /*
739          * Finish setup now that we have a good root volume.
740          *
741          * The top 16 bits of fsid.val[1] is a pfs id.
742          */
743         ksnprintf(mp->mnt_stat.f_mntfromname,
744                   sizeof(mp->mnt_stat.f_mntfromname), "%s",
745                   rootvol->ondisk->vol_name);
746         mp->mnt_stat.f_fsid.val[0] =
747                 crc32((char *)&rootvol->ondisk->vol_fsid + 0, 8);
748         mp->mnt_stat.f_fsid.val[1] =
749                 crc32((char *)&rootvol->ondisk->vol_fsid + 8, 8);
750         mp->mnt_stat.f_fsid.val[1] &= 0x0000FFFF;
751
752         mp->mnt_vstat.f_fsid_uuid = rootvol->ondisk->vol_fsid;
753         mp->mnt_vstat.f_fsid = crc32(&mp->mnt_vstat.f_fsid_uuid,
754                                      sizeof(mp->mnt_vstat.f_fsid_uuid));
755
756         /*
757          * Certain often-modified fields in the root volume are cached in
758          * the hammer_mount structure so we do not have to generate lots
759          * of little UNDO structures for them.
760          *
761          * Recopy after recovery.  This also has the side effect of
762          * setting our cached undo FIFO's first_offset, which serves to
763          * placemark the FIFO start for the NEXT flush cycle while the
764          * on-disk first_offset represents the LAST flush cycle.
765          */
766         hmp->next_tid = rootvol->ondisk->vol0_next_tid;
767         hmp->flush_tid1 = hmp->next_tid;
768         hmp->flush_tid2 = hmp->next_tid;
769         bcopy(rootvol->ondisk->vol0_blockmap, hmp->blockmap,
770               sizeof(hmp->blockmap));
771         hmp->copy_stat_freebigblocks = rootvol->ondisk->vol0_stat_freebigblocks;
772
773         hammer_flusher_create(hmp);
774
775         /*
776          * Locate the root directory using the root cluster's B-Tree as a
777          * starting point.  The root directory uses an obj_id of 1.
778          *
779          * FUTURE: Leave the root directory cached referenced but unlocked
780          * in hmp->rootvp (need to flush it on unmount).
781          */
782         error = hammer_vfs_vget(mp, NULL, 1, &rootvp);
783         if (error)
784                 goto done;
785         vput(rootvp);
786         /*vn_unlock(hmp->rootvp);*/
787         if (hmp->ronly == 0)
788                 error = hammer_recover_stage2(hmp, rootvol);
789
790         /*
791          * If the stage2 recovery fails be sure to clean out all cached
792          * vnodes before throwing away the mount structure or bad things
793          * will happen.
794          */
795         if (error)
796                 vflush(mp, 0, 0);
797
798 done:
799         hammer_rel_volume(rootvol, 0);
800 failed:
801         /*
802          * Cleanup and return.
803          */
804         if (error) {
805                 /* called with fs_token held */
806                 hammer_free_hmp(mp);
807         } else {
808                 lwkt_reltoken(&hmp->fs_token);
809         }
810         return (error);
811 }
812
813 static int
814 hammer_vfs_unmount(struct mount *mp, int mntflags)
815 {
816         hammer_mount_t hmp = (void *)mp->mnt_data;
817         int flags;
818         int error;
819
820         /*
821          * Clean out the vnodes
822          */
823         lwkt_gettoken(&hmp->fs_token);
824         flags = 0;
825         if (mntflags & MNT_FORCE)
826                 flags |= FORCECLOSE;
827         error = vflush(mp, 0, flags);
828
829         /*
830          * Clean up the internal mount structure and related entities.  This
831          * may issue I/O.
832          */
833         if (error == 0) {
834                 /* called with fs_token held */
835                 hammer_free_hmp(mp);
836         } else {
837                 lwkt_reltoken(&hmp->fs_token);
838         }
839         return(error);
840 }
841
842 /*
843  * Clean up the internal mount structure and disassociate it from the mount.
844  * This may issue I/O.
845  *
846  * Called with fs_token held.
847  */
848 static void
849 hammer_free_hmp(struct mount *mp)
850 {
851         hammer_mount_t hmp = (void *)mp->mnt_data;
852         hammer_flush_group_t flg;
853         int count;
854         int dummy;
855
856         /*
857          * Flush anything dirty.  This won't even run if the
858          * filesystem errored-out.
859          */
860         count = 0;
861         while (hammer_flusher_haswork(hmp)) {
862                 hammer_flusher_sync(hmp);
863                 ++count;
864                 if (count >= 5) {
865                         if (count == 5)
866                                 kprintf("HAMMER: umount flushing.");
867                         else
868                                 kprintf(".");
869                         tsleep(&dummy, 0, "hmrufl", hz);
870                 }
871                 if (count == 30) {
872                         kprintf("giving up\n");
873                         break;
874                 }
875         }
876         if (count >= 5 && count < 30)
877                 kprintf("\n");
878
879         /*
880          * If the mount had a critical error we have to destroy any
881          * remaining inodes before we can finish cleaning up the flusher.
882          */
883         if (hmp->flags & HAMMER_MOUNT_CRITICAL_ERROR) {
884                 RB_SCAN(hammer_ino_rb_tree, &hmp->rb_inos_root, NULL,
885                         hammer_destroy_inode_callback, NULL);
886         }
887
888         /*
889          * There shouldn't be any inodes left now and any left over
890          * flush groups should now be empty.
891          */
892         KKASSERT(RB_EMPTY(&hmp->rb_inos_root));
893         while ((flg = TAILQ_FIRST(&hmp->flush_group_list)) != NULL) {
894                 TAILQ_REMOVE(&hmp->flush_group_list, flg, flush_entry);
895                 KKASSERT(RB_EMPTY(&flg->flush_tree));
896                 if (flg->refs) {
897                         kprintf("HAMMER: Warning, flush_group %p was "
898                                 "not empty on umount!\n", flg);
899                 }
900                 kfree(flg, hmp->m_misc);
901         }
902
903         /*
904          * We can finally destroy the flusher
905          */
906         hammer_flusher_destroy(hmp);
907
908         /*
909          * We may have held recovered buffers due to a read-only mount.
910          * These must be discarded.
911          */
912         if (hmp->ronly)
913                 hammer_recover_flush_buffers(hmp, NULL, -1);
914
915         /*
916          * Unload buffers and then volumes
917          */
918         RB_SCAN(hammer_buf_rb_tree, &hmp->rb_bufs_root, NULL,
919                 hammer_unload_buffer, NULL);
920         RB_SCAN(hammer_vol_rb_tree, &hmp->rb_vols_root, NULL,
921                 hammer_unload_volume, NULL);
922
923         mp->mnt_data = NULL;
924         mp->mnt_flag &= ~MNT_LOCAL;
925         hmp->mp = NULL;
926         hammer_destroy_objid_cache(hmp);
927         hammer_destroy_dedup_cache(hmp);
928         if (hmp->dedup_free_cache != NULL) {
929                 kfree(hmp->dedup_free_cache, hmp->m_misc);
930                 hmp->dedup_free_cache = NULL;
931         }
932         kmalloc_destroy(&hmp->m_misc);
933         kmalloc_destroy(&hmp->m_inodes);
934         lwkt_reltoken(&hmp->fs_token);
935         kfree(hmp, M_HAMMER);
936 }
937
938 /*
939  * Report critical errors.  ip may be NULL.
940  */
941 void
942 hammer_critical_error(hammer_mount_t hmp, hammer_inode_t ip,
943                       int error, const char *msg)
944 {
945         hmp->flags |= HAMMER_MOUNT_CRITICAL_ERROR;
946
947         krateprintf(&hmp->krate,
948                     "HAMMER(%s): Critical error inode=%jd error=%d %s\n",
949                     hmp->mp->mnt_stat.f_mntfromname,
950                     (intmax_t)(ip ? ip->obj_id : -1),
951                     error, msg);
952
953         if (hmp->ronly == 0) {
954                 hmp->ronly = 2;         /* special errored read-only mode */
955                 hmp->mp->mnt_flag |= MNT_RDONLY;
956                 kprintf("HAMMER(%s): Forcing read-only mode\n",
957                         hmp->mp->mnt_stat.f_mntfromname);
958         }
959         hmp->error = error;
960         if (hammer_debug_critical)
961                 Debugger("Entering debugger");
962 }
963
964
965 /*
966  * Obtain a vnode for the specified inode number.  An exclusively locked
967  * vnode is returned.
968  */
969 int
970 hammer_vfs_vget(struct mount *mp, struct vnode *dvp,
971                 ino_t ino, struct vnode **vpp)
972 {
973         struct hammer_transaction trans;
974         struct hammer_mount *hmp = (void *)mp->mnt_data;
975         struct hammer_inode *ip;
976         int error;
977         u_int32_t localization;
978
979         lwkt_gettoken(&hmp->fs_token);
980         hammer_simple_transaction(&trans, hmp);
981
982         /*
983          * If a directory vnode is supplied (mainly NFS) then we can acquire
984          * the PFS domain from it.  Otherwise we would only be able to vget
985          * inodes in the root PFS.
986          */
987         if (dvp) {
988                 localization = HAMMER_DEF_LOCALIZATION +
989                                 VTOI(dvp)->obj_localization;
990         } else {
991                 localization = HAMMER_DEF_LOCALIZATION;
992         }
993
994         /*
995          * Lookup the requested HAMMER inode.  The structure must be
996          * left unlocked while we manipulate the related vnode to avoid
997          * a deadlock.
998          */
999         ip = hammer_get_inode(&trans, NULL, ino,
1000                               hmp->asof, localization,
1001                               0, &error);
1002         if (ip == NULL) {
1003                 *vpp = NULL;
1004         } else {
1005                 error = hammer_get_vnode(ip, vpp);
1006                 hammer_rel_inode(ip, 0);
1007         }
1008         hammer_done_transaction(&trans);
1009         lwkt_reltoken(&hmp->fs_token);
1010         return (error);
1011 }
1012
1013 /*
1014  * Return the root vnode for the filesystem.
1015  *
1016  * HAMMER stores the root vnode in the hammer_mount structure so
1017  * getting it is easy.
1018  */
1019 static int
1020 hammer_vfs_root(struct mount *mp, struct vnode **vpp)
1021 {
1022         int error;
1023
1024         error = hammer_vfs_vget(mp, NULL, 1, vpp);
1025         return (error);
1026 }
1027
1028 static int
1029 hammer_vfs_statfs(struct mount *mp, struct statfs *sbp, struct ucred *cred)
1030 {
1031         struct hammer_mount *hmp = (void *)mp->mnt_data;
1032         hammer_volume_t volume;
1033         hammer_volume_ondisk_t ondisk;
1034         int error;
1035         int64_t bfree;
1036         int64_t breserved;
1037
1038         lwkt_gettoken(&hmp->fs_token);
1039         volume = hammer_get_root_volume(hmp, &error);
1040         if (error) {
1041                 lwkt_reltoken(&hmp->fs_token);
1042                 return(error);
1043         }
1044         ondisk = volume->ondisk;
1045
1046         /*
1047          * Basic stats
1048          */
1049         _hammer_checkspace(hmp, HAMMER_CHKSPC_WRITE, &breserved);
1050         mp->mnt_stat.f_files = ondisk->vol0_stat_inodes;
1051         bfree = ondisk->vol0_stat_freebigblocks * HAMMER_LARGEBLOCK_SIZE;
1052         hammer_rel_volume(volume, 0);
1053
1054         mp->mnt_stat.f_bfree = (bfree - breserved) / HAMMER_BUFSIZE;
1055         mp->mnt_stat.f_bavail = mp->mnt_stat.f_bfree;
1056         if (mp->mnt_stat.f_files < 0)
1057                 mp->mnt_stat.f_files = 0;
1058
1059         *sbp = mp->mnt_stat;
1060         lwkt_reltoken(&hmp->fs_token);
1061         return(0);
1062 }
1063
1064 static int
1065 hammer_vfs_statvfs(struct mount *mp, struct statvfs *sbp, struct ucred *cred)
1066 {
1067         struct hammer_mount *hmp = (void *)mp->mnt_data;
1068         hammer_volume_t volume;
1069         hammer_volume_ondisk_t ondisk;
1070         int error;
1071         int64_t bfree;
1072         int64_t breserved;
1073
1074         lwkt_gettoken(&hmp->fs_token);
1075         volume = hammer_get_root_volume(hmp, &error);
1076         if (error) {
1077                 lwkt_reltoken(&hmp->fs_token);
1078                 return(error);
1079         }
1080         ondisk = volume->ondisk;
1081
1082         /*
1083          * Basic stats
1084          */
1085         _hammer_checkspace(hmp, HAMMER_CHKSPC_WRITE, &breserved);
1086         mp->mnt_vstat.f_files = ondisk->vol0_stat_inodes;
1087         bfree = ondisk->vol0_stat_freebigblocks * HAMMER_LARGEBLOCK_SIZE;
1088         hammer_rel_volume(volume, 0);
1089
1090         mp->mnt_vstat.f_bfree = (bfree - breserved) / HAMMER_BUFSIZE;
1091         mp->mnt_vstat.f_bavail = mp->mnt_vstat.f_bfree;
1092         if (mp->mnt_vstat.f_files < 0)
1093                 mp->mnt_vstat.f_files = 0;
1094         *sbp = mp->mnt_vstat;
1095         lwkt_reltoken(&hmp->fs_token);
1096         return(0);
1097 }
1098
1099 /*
1100  * Sync the filesystem.  Currently we have to run it twice, the second
1101  * one will advance the undo start index to the end index, so if a crash
1102  * occurs no undos will be run on mount.
1103  *
1104  * We do not sync the filesystem if we are called from a panic.  If we did
1105  * we might end up blowing up a sync that was already in progress.
1106  */
1107 static int
1108 hammer_vfs_sync(struct mount *mp, int waitfor)
1109 {
1110         struct hammer_mount *hmp = (void *)mp->mnt_data;
1111         int error;
1112
1113         lwkt_gettoken(&hmp->fs_token);
1114         if (panicstr == NULL) {
1115                 error = hammer_sync_hmp(hmp, waitfor);
1116         } else {
1117                 error = EIO;
1118         }
1119         lwkt_reltoken(&hmp->fs_token);
1120         return (error);
1121 }
1122
1123 /*
1124  * Convert a vnode to a file handle.
1125  *
1126  * Accesses read-only fields on already-referenced structures so
1127  * no token is needed.
1128  */
1129 static int
1130 hammer_vfs_vptofh(struct vnode *vp, struct fid *fhp)
1131 {
1132         hammer_inode_t ip;
1133
1134         KKASSERT(MAXFIDSZ >= 16);
1135         ip = VTOI(vp);
1136         fhp->fid_len = offsetof(struct fid, fid_data[16]);
1137         fhp->fid_ext = ip->obj_localization >> 16;
1138         bcopy(&ip->obj_id, fhp->fid_data + 0, sizeof(ip->obj_id));
1139         bcopy(&ip->obj_asof, fhp->fid_data + 8, sizeof(ip->obj_asof));
1140         return(0);
1141 }
1142
1143
1144 /*
1145  * Convert a file handle back to a vnode.
1146  *
1147  * Use rootvp to enforce PFS isolation when a PFS is exported via a
1148  * null mount.
1149  */
1150 static int
1151 hammer_vfs_fhtovp(struct mount *mp, struct vnode *rootvp,
1152                   struct fid *fhp, struct vnode **vpp)
1153 {
1154         hammer_mount_t hmp = (void *)mp->mnt_data;
1155         struct hammer_transaction trans;
1156         struct hammer_inode *ip;
1157         struct hammer_inode_info info;
1158         int error;
1159         u_int32_t localization;
1160
1161         bcopy(fhp->fid_data + 0, &info.obj_id, sizeof(info.obj_id));
1162         bcopy(fhp->fid_data + 8, &info.obj_asof, sizeof(info.obj_asof));
1163         if (rootvp)
1164                 localization = VTOI(rootvp)->obj_localization;
1165         else
1166                 localization = (u_int32_t)fhp->fid_ext << 16;
1167
1168         lwkt_gettoken(&hmp->fs_token);
1169         hammer_simple_transaction(&trans, hmp);
1170
1171         /*
1172          * Get/allocate the hammer_inode structure.  The structure must be
1173          * unlocked while we manipulate the related vnode to avoid a
1174          * deadlock.
1175          */
1176         ip = hammer_get_inode(&trans, NULL, info.obj_id,
1177                               info.obj_asof, localization, 0, &error);
1178         if (ip) {
1179                 error = hammer_get_vnode(ip, vpp);
1180                 hammer_rel_inode(ip, 0);
1181         } else {
1182                 *vpp = NULL;
1183         }
1184         hammer_done_transaction(&trans);
1185         lwkt_reltoken(&hmp->fs_token);
1186         return (error);
1187 }
1188
1189 static int
1190 hammer_vfs_checkexp(struct mount *mp, struct sockaddr *nam,
1191                     int *exflagsp, struct ucred **credanonp)
1192 {
1193         hammer_mount_t hmp = (void *)mp->mnt_data;
1194         struct netcred *np;
1195         int error;
1196
1197         lwkt_gettoken(&hmp->fs_token);
1198         np = vfs_export_lookup(mp, &hmp->export, nam);
1199         if (np) {
1200                 *exflagsp = np->netc_exflags;
1201                 *credanonp = &np->netc_anon;
1202                 error = 0;
1203         } else {
1204                 error = EACCES;
1205         }
1206         lwkt_reltoken(&hmp->fs_token);
1207         return (error);
1208
1209 }
1210
1211 int
1212 hammer_vfs_export(struct mount *mp, int op, const struct export_args *export)
1213 {
1214         hammer_mount_t hmp = (void *)mp->mnt_data;
1215         int error;
1216
1217         lwkt_gettoken(&hmp->fs_token);
1218
1219         switch(op) {
1220         case MOUNTCTL_SET_EXPORT:
1221                 error = vfs_export(mp, &hmp->export, export);
1222                 break;
1223         default:
1224                 error = EOPNOTSUPP;
1225                 break;
1226         }
1227         lwkt_reltoken(&hmp->fs_token);
1228
1229         return(error);
1230 }
1231